The ball ______ two or three Times before rolling down the slope.

A．requires minimal usage fees
B．offers price advantages to users
C．is more efficient than traditional banking
D．is environmentally-conscious

A．efficiency must be raised in the poultry industry
B．raising poultry can provide more protein than growing grain
C．factory farming will do more harm than good to developing countries
D．hungry nations may benefit from the development of the poultry industry